CN101255330A - Atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring and method for manufacturing same - Google Patents
Atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring and method for manufacturing same Download PDFInfo
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- CN101255330A CN101255330A CNA2008100604773A CN200810060477A CN101255330A CN 101255330 A CN101255330 A CN 101255330A CN A2008100604773 A CNA2008100604773 A CN A2008100604773A CN 200810060477 A CN200810060477 A CN 200810060477A CN 101255330 A CN101255330 A CN 101255330A
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Abstract
The invention provides a micropore siliconcarbide graphite self-lubricating seal ring which is sintered at normal pressure, comprising 90-96 weight% of siliconcarbide powder, 2-8 weight% of graphite powder, 2-5 weight% of polyvinyl alcohol. The preparation method thereof comprises: weighting the materials and uniformly mixing the siliconcarbide powder and graphite powder; adding polyviny alcohol into deionized water and heating to melt, then adding the uniform mixture powder into the water solution of polyvinyl alcohol and stirring into slurry, grinding at normal temperature; laying the slurry in a spry drying tower to granulate and in mould to perform pressure moulding; sintering the moulded products in vacuum high-temperature furnace; cooling to normal temperature. The siliconcarbide seal ring not only contains free graphite, but also contains crosslinking pore formed by bonding the siliconcarbide and polyvinyl alcohol to increase elasticity and improve the self-lubrication of siliconcarbide seal ring and thermal shock resistance. The seal ring can take effect of buffer function in hard-to-hard friction assembly and the kinetic friction coefficient is reduced and the failure of seal ring is prevented and the service life is prolonges by double times.
Description
Technical field
The present invention relates to a kind of wear ring, particularly microporous carborundum graphite self-lubricating seal ring and normal pressure-sintered manufacture method thereof.
Background technology
Ceramic-seal ring such as silicon carbide sintered ceramic wear ring, because its hardness height, wear resisting property is good, premium propertiess such as high temperature resistant, resistance to chemical attack are widely used in the sealing of abominable working conditions.The silicon carbide sealed ring resistance to elevated temperatures that present domestic reaction sintering is produced is poor, and the bending strength of silicon carbide ceramics sharply descended when particularly temperature surpassed 1400 ℃.These defectives that pure silicon carbide sealed ring exists are difficult to adapt in many bad working environments conditions to be used, particularly firmly to hard seal friction the time, it is bonding to be easy to generate the two ends working face, and causes both ends of the surface in working order down, frictional coefficient increases, and causes sealing to be lost efficacy in advance.CN1830900A proposes a kind of silicon carbide sealed ring manufacture method, and it adopts nanometer materials, and the ultrahigh-temperature sintering process improves the carborundum content of wear ring product, and hardness is big, good corrosion resistance, flexural strength height.But hardness improves, and when firmly hard sealing being rubbed, can produce two working faces equally and fit, and the work coefficient of friction still can take place increase, and causes sealing to be lost efficacy in advance.Therefore improving high temperature resistant, wear-resistant, the corrosion resistant while of silicon carbide sealed ring, how to reduce coefficient of friction, it is bonding to produce working face when preventing firmly hard sealing friction, becomes one of technical barrier that improves ceramic-seal ring work-ing life.
Summary of the invention
The technical problem to be solved in the present invention is to improve high temperature resistant, wear-resistant, the corrosion-resistant and flexural strength of silicon carbide sealed ring high the time by improving material composition and sintering process, reaching, and has effects such as good self lubricity and dry grinding property.
The present invention adopts following technical proposals to realize above-mentioned purpose.
Atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring is characterized in that raw material consists of: carborundum powder 90～96% weight, Graphite Powder 99 2～8% weight, polyvinyl alcohol 2～5% weight.
The atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring manufacture method is characterized in that may further comprise the steps:
A, silicon carbide micro-powder, graphite microparticles and polyvinyl alcohol are weighed by composition, and carbon silicon powder and graphite microparticles are mixed;
B adds polyvinyl alcohol in the deionized water, and heat temperature raising is to dissolving fully while stirring, and weaker concn is 4～6%;
C, the powder that will mix with polyvinyl alcohol water solution by powder: polyvinyl alcohol water solution is 1: 05 volume ratio dilution, stirs into slurry, and the normal temperature ball milling is 1～6 hour in ball mill;
D, the slurry that above-mentioned ball milling is crossed place the spray-drying tower mist projection granulating, and pumping pressure is 1～4MPa, 180～220 ℃ of inlet temperatures, 60～150 ℃ of temperature outs;
E, the mist projection granulating powder is fully mixed in mixing machine again, sealing is preserved in the bucket of packing into;
F, will be the mist projection granulating powder of uniform mixing place and impose 70～200MPa/cm in the mould
2Compression moulding;
G, the general goods of compression moulding put into the high-temperature vacuum furnace sintering, rise in temperature and use argon shield more than 1200 ℃, and 2000～2280 ℃ of sintering of sintering temperature 5 hours were incubated after 0.5～4 hour, reduced to room temperature and came out of the stove.
Beneficial effect of the present invention is, adds graphite microparticles and polyvinyl alcohol during the silicon carbide sealed ring raw material is formed, and makes and has both contained free graphite in the silicon carbide sealed ring, contains the crosslinked hole that silicon carbide and polyvinyl alcohol bonding forms again.Adopt normal pressure-sintered technology, it is the high-temperature vacuum sintering, make polyvinyl alcohol agglutinating silicon carbide and produce micro-pore in high temperature because polyvinyl alcohol decomposes, the existence of free graphite and crosslinked hole has reduced the hardness of silicon carbide sealed ring, increase elasticity, improved the self lubricity of silicon carbide sealed ring, both improved dry friction and also improved its resistance to sudden heating, improved hard supporting capacity hard situation overdraft, rotating speed.The crosslinked hole that silicon carbide sealed ring contains will make medium play the shunting lubricant effect as the storage tank of fluid medium, make the silicon carbide sealed ring product contain the graphite and the self-priming liquid film function with uniform micro distribution of self-lubricating property.The anti-dry grinding and the resistance to sudden heating of silicon carbide sealed ring are improved simultaneously, thereby in firmly to the hard friction combination, can play shock absorption, reduce the dyanainic friction coefficient, stop the inefficacy of wear ring, product work-ing life of utilizing that present method makes, the silicon carbide than produced in conventional processes prolonged 2 times.
Embodiment
Main raw material(s) source: silicon carbide SiC, submicron order a-SiC, granularity (d50) 0.5～0.8 μ m, purity 〉=98.5%, Fe
2O
3≤ 0.05%, the commercial goods, produce in Shandong Wei Fang or Zhengzhou, Henan.
Graphite C is high-purity graphite powder M106, purity＞95%, granularity 30～120 orders, commercial goods.
Linking agent, PVAC polyvinylalcohol, product standard and type 1788.
Embodiment 1:
The composition of atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring: alpha-silicon carbide powder 90% weight, Graphite Powder 99 7% weight, polyvinyl alcohol 3% weight.
Processing step:
Alpha-silicon carbide micro mist, graphite microparticles and the polyvinyl alcohol that will meet purity and granularity requirements are weighed by above-mentioned composition, and described silicon carbide and graphite are mixed;
Polyvinyl alcohol is added in the deionized water, and the limit feeds intake while stirring 80～90 ℃ of heat temperature raisings to dissolving fully, and weaker concn is 6%;
With the powder that mixed with polyvinyl alcohol water solution by powder: polyvinyl alcohol water solution is 1: 0.5 volume ratio dilution, stirs into slurry, and ball mill speed is 200～500 rev/mins in the ball milling bucket, ball milling 1～6 hour;
The slurry that above-mentioned ball milling is crossed places spray-drying tower mist projection granulating GL-25 ionspray drying machine, pumps pressure 1～4MPa, and inlet temperature is controlled at 180～220 ℃, 60～150 ℃ of temperature outs;
The mist projection granulating powder is placed on restir mixes in the mixing machine, sealing was preserved 6～12 hours in the bucket of packing into;
Mist projection granulating powder through mixing, seal preservation is placed in the forming mould, imposes 70～200MPa/cm with hydropress
2Compression moulding.
The goods of compression moulding are placed on sintering in the high-temperature vacuum furnace, rise to more than 1200 ℃ in temperature and use argon shield, 2000～2280 ℃ of sintering of sintering temperature 5 hours were incubated after 0.5～4 hour, reduced to room temperature and came out of the stove;
With the product surface grinding correction of sinter molding, check warehouse-in.
The preproduction performance index: preproduction is pressed the product sample mode, and sample presentation gives Shanghai silicate institute detected result as follows: SiC content＞90% weight, carbon and other impurity＜10% weight, volume density 2.6～2.9g/cm
3, knoop hardness (Knoop) 2600Kg/mm
2, ultimate compression strength＞1700Mpa, bending strength＞140Mpa, grain-size 3～10um, maximum is no more than 60um, and graphite granule is no more than 280um, and the pore size maximum is no more than 60um, void content 4%～7%.
Embodiment 2
The composition of atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring: alpha-silicon carbide powder 96% weight, Graphite Powder 99 2% weight, polyvinyl alcohol 2% weight.
Processing step:
Alpha-silicon carbide micro mist, graphite microparticles and the polyvinyl alcohol that will meet purity and granularity requirements are weighed in above-mentioned composition ratio, and described silicon carbide and graphite are mixed;
With deionized water dilution dissolving, the limit feeds intake while stirring 80～90 ℃ of heat temperature raisings to dissolving fully with polyvinyl alcohol, and weaker concn is 4%;
With the powder that mixed with polyvinyl alcohol water solution by powder: polyvinyl alcohol water solution is 1: 0.5 volume ratio dilution, stirs into slurry, and ball mill speed is 200～300 rev/mins in the ball milling bucket, ball milling 1～6 hour;
The slurry that above-mentioned ball milling is crossed places the spray-drying tower mist projection granulating, and G1-25 ionspray drying machine pumps pressure 1～4MPa, and inlet temperature is controlled at 180～220 ℃, 60～150 ℃ of temperature outs;
The mist projection granulating powder is placed on restir mixes in the mixing machine, sealing was preserved 6～12 hours in the bucket of packing into;
Mist projection granulating powder through mixing, seal preservation is placed in the forming mould, with the oily machine 70～200MPa/cm that exerts pressure
2Compression moulding.
The goods of compression moulding are placed on sintering in the high-temperature vacuum furnace, rise to more than 1200 ℃ in temperature and use argon shield, 2000～2280 ℃ of sintering of sintering temperature 5 hours were incubated after 0.5～4 hour, reduced to room temperature and came out of the stove;
With the product surface grinding correction of sinter molding, check warehouse-in.
The preproduction performance index: preproduction is pressed the product sample mode, and sample presentation gives Shanghai silicate institute detected result as follows: SiC content＞90% weight, carbon and other impurity＜10% weight, volume density 2.6～2.9g/cm
3, knoop hardness (Knoop) 2800Kg/mm
2, ultimate compression strength＞1800Mpa, bending strength＞150Mpa, grain-size 3～9um, maximum is no more than 55um, and graphite granule is no more than 260um, and the pore size maximum is no more than 55um, void content 4%～7%.
Claims (3)
1, atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring is characterized in that raw material consists of: carborundum powder 90～96% weight, Graphite Powder 99 2～8% weight, polyvinyl alcohol 2～5% weight.
2, atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring according to claim 1, the performance index that it is characterized in that atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring are carborundum content＞90% weight, carbon and other impurity＜10% weight, volume density 2.6～2.9g/cm
3, knoop hardness 2600～2800Kg/mm
2, ultimate compression strength＞1700Mpa, bending strength＞140Mpa, grain-size 3～10um maximum is no more than 60um, and the graphite granule size is no more than 280um, and the pore size maximum is no more than 60um, void content 4%～7%.
3, atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring manufacture method is characterized in that may further comprise the steps:
A, silicon carbide micro-powder, graphite microparticles and polyvinyl alcohol are weighed by composition, and carbon silicon powder and graphite microparticles are mixed;
B adds polyvinyl alcohol in the deionized water, and heat temperature raising is to dissolving fully while stirring, and weaker concn is 4～6%;
C, the powder that will mix with polyvinyl alcohol water solution by powder: polyvinyl alcohol water solution is 1: 05 volume ratio dilution, stirs into slurry, and the normal temperature ball milling is 1～6 hour in ball mill;
D, the slurry that above-mentioned ball milling is crossed place the spray-drying tower mist projection granulating, and pumping pressure is 1～4MPa, 180～220 ℃ of inlet temperatures, 60～150 ℃ of temperature outs;
E, the mist projection granulating powder is fully mixed in mixing machine again, sealing is preserved in the bucket of packing into;
F, will be the mist projection granulating powder of uniform mixing place and impose 70～200MPa/cm in the mould
2Compression moulding;
G, the general goods of compression moulding put into the high-temperature vacuum furnace sintering, rise in temperature and use argon shield more than 1200 ℃, and 2000～2280 ℃ of sintering of sintering temperature 5 hours were incubated after 0.5～4 hour, reduced to room temperature and came out of the stove.
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|---|---|---|---|
| CN2008100604773A CN101255330B (en) | 2008-04-11 | 2008-04-11 | Atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring and method for manufacturing same |
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|---|---|---|---|
| CN2008100604773A CN101255330B (en) | 2008-04-11 | 2008-04-11 | Atmosphere pressure sintered microporous carborundum graphite self-lubricating seal ring and method for manufacturing same |
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| CN101255330A true CN101255330A (en) | 2008-09-03 |
| CN101255330B CN101255330B (en) | 2011-02-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261841A (en) * | 2011-08-11 | 2011-11-30 | 南通汉瑞实业有限公司 | Crucible cover, manufacturing method thereof and crucible furnace provided with crucible cover |
| CN103727236A (en) * | 2013-12-19 | 2014-04-16 | 马鞍山市荣亿密封材料有限责任公司 | Self-lubricating seal ring |
| CN104061328A (en) * | 2014-05-28 | 2014-09-24 | 宁波东联密封件有限公司 | Mechanical seal with self-lubricating property |
| CN107200584A (en) * | 2017-07-19 | 2017-09-26 | 安徽东迅密封科技有限公司 | A kind of carborundum encapsulant and its sintering method |
-
2008
- 2008-04-11 CN CN2008100604773A patent/CN101255330B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261841A (en) * | 2011-08-11 | 2011-11-30 | 南通汉瑞实业有限公司 | Crucible cover, manufacturing method thereof and crucible furnace provided with crucible cover |
| CN102261841B (en) * | 2011-08-11 | 2013-02-13 | 南通汉瑞实业有限公司 | Crucible cover, manufacturing method thereof and crucible furnace provided with crucible cover |
| CN103727236A (en) * | 2013-12-19 | 2014-04-16 | 马鞍山市荣亿密封材料有限责任公司 | Self-lubricating seal ring |
| CN103727236B (en) * | 2013-12-19 | 2016-08-17 | 马鞍山市荣亿密封材料有限责任公司 | A kind of self-lubricating sealing ring |
| CN104061328A (en) * | 2014-05-28 | 2014-09-24 | 宁波东联密封件有限公司 | Mechanical seal with self-lubricating property |
| CN107200584A (en) * | 2017-07-19 | 2017-09-26 | 安徽东迅密封科技有限公司 | A kind of carborundum encapsulant and its sintering method |
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|---|---|
| CN101255330B (en) | 2011-02-16 |
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